We use the perfective will have when we are looking back from a point in time when something will have happened.
By the end of the decade scientists will have discovered a cure for influenza.
I will phone at six o’clock. He will have got home by then.
or looking "back" from the present:
Look at the time. The match will have started.
It’s half past five. Dad will have finished work.
We use would have as the past tense form of will have:
I phoned at six o’clock. I knew he would have got home by then.
It was half past five. Dad would have finished work.
We use would have in past conditionals to talk about something that did not happen:
If it had been a little warmer we would have gone for a swim.
He would have been very angry if he had seen you.
- Determiners and quantifiers
- irregular verbs
- question forms
- verb phrases
- present tense
- past tense
- perfective aspect
- continuous aspect
- active and passive voice
- to + infinitive
- -ing forms
- talking about the present
- talking about the past
- talking about the future
- verbs in time clauses and if clauses
- wishes and hypotheses
- the verb be
- link verbs
- delexical verbs like have, take, make and give
- Modal verbs
- double object verbs
- phrasal verbs
- reflexive and ergative verbs
- verbs followed by to + infinitive
- verbs followed by -ing clauses
- verbs followed by that clause
- Clause, phrase and sentence
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